Mina Maddock was born into a middle-class family, but quickly broke out of that sphere when she had her modeling breakout. Leaving her parents behind, she moved to a big apartment in New York as her career grew fast and Zeus quickly took notice. Approaching her after a photoshoot, they initiated an affair who would last for almost 4 months, when he moved on to other passions and left her pregnant. Mina seriously considered abortion, but ended up going through with the pregnancy. However, Hugh's birth caused a blow on her career she would take years to repair. Her resentment of the child was obvious, leaving him to be raised by nannies while his mother went all over the world to regain her former prestige. Hugh, however, wanted nothing more than to earn her praise, failing miserably and she grew more and more distant, too involved in her own world. Mina developed quite the drug problem and didn't really try to shield her son from that. Whatever childish adoration he had for her quickly faded away, making him a detached, quiet kid. When he was 8, she OD'd on coke and died a few weeks later from complications on the hospital. He got the news in school, which prompted Dane, the satyr watching over him, to take him to camp before things got too critical.
Discovering that his father was a literal greek god, the boss of the gods on top of all, was reinvigorating for a kid who spent his childhood treated like trash by his mother. In Camp Half-Blood, Hugh shined and grew like never before. The following four years were the best of his life.
Today, however, he doesn't remember any of it.
At seventeen, three campers left on a quest to move an article, on a request of Melinoe for her children. They failed miserably, being ambushed and captured, prompting camp to send a rescue team due to the quest's sensitivity. Hugh was the leader of the rescue team, composed by two children of Mnemosyne, Anthony and Ralph, a son of Hermes, Tyler, and a daughter of Epiphron, Jocelyn, Anthony's girlfriend. At first, everything seemed to go great. They rescued the three campers, who were too weak to continue and were sent back. Ariadne had agreed to help them, giving Hugh the means to avoid the multiple traps placed to protect the artifact, and they progressed fast. Then, it happened. Hugh's temper exploded with Anthony, starting a big fight between the two, and in his distraction, Tyler and Ralph triggered a trap, summoning a Lydian Drakon. After Jocelyn broke the fight, they turned to go against the monster, but Hugh was too angry at Anthony to let go just like that. When a spray of poison was aimed at the other boy, Hugh just stood there, watching him be corroded. The drakon was clearly too much for them to handle, so when he found himself standing alone with Jocelyn, he acted on instinct, throwing her over his shoulder and flying away as fast as possible.
Upon arriving into a safer place, Hugh was in shock over what he had done and Jocelyn was so enraged she could have killed him with a though. She yelled at the sky for justice, invoking the parents of her dead companions to curse the man who had them killed. And they were happy to oblige. An audience was held on Olympus, where Mnemosyne cursed him to eternal amnesia whenever he was not at camp, while Hermes gave him a restless, wandering spirit to keep him on the move. Hestia managed to convince Mnemosyne to restrict the curse in order to allow him to survive, having him remember his identity as a demigod, training, the location of camp, etc., aside from making his forgetfulness less acute when it came to practicalities of life. Zeus couldn't protect his son from the wrath of the two gods, but instead bound Jocelyn to him, so that whenever he returned to camp, she would know and return to inform him of what happened and who he really was.
Needless to say nothing was ever the same.